var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
//session放入redis
var session = require('express-session');
var RedisStore = require('connect-redis')(session);
var redisCli = require('./utils/RedisCli');

var routes = require('./routes/index');
var users = require('./routes/users');



var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
//app.use相当于过滤器,一层接一层,顺序会影响结果,每个use最后没有调用next则不会执行下一个use
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
//处理session
app.use(session({
  store: new RedisStore({
    client: redisCli.getClient() //统一只使用一个连接,如果不配置,则会在每次调用该构造函数时创建一个redis的连接
  }),
  secret: 'keyboard cat',
  cookie: {maxAge: 1000 * 60 * 60}, //一小时
  resave: false, // don't save session if unmodified
  saveUninitialized: false // don't create session until something stored
}));
app.use(function (req, res, next) {
  if (!req.session) {
    return next(new Error('oh no')); // handle error
  }
  next(); // otherwise continue
});//与redis断开连接后报错

app.use('/', routes);
app.use('/users', users);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}



// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});

module.exports = app;